Cassava yield losses from brown leaf spot induced by Cercosporidium henningsii
1984
Teri, J.M. | Mtakwa, P.W. | Mshana, D. (University of Dar es Salaam (Tanzania))
We studied progress of cassava brown leaf spot (BLS) and its effects on yield of five cassava cultivars: Aipin Valenca, F279, Mzungu, Tanga, and T27. Field plots of each cultivar were established in an area where BLS is endemic, and half the plots were sprayed with the fungicide benomyl. We recorded disease progress in the plots by counting the number of lesions per plant and by recording percent defoliation. Disease intensity was highest between 3 and 6 months after planting. In 1981-82, the epiphytotic reached a peak 3 months after planting; in 1982-83, there was a low peak 3 months after planting and a higher peak at 5 months. All variables were subjected to analysis with Duncan's new multiple range test. The independent t-test showed very highly significant differences between sprayed and unsprayed plots. Root yield from fungicide sprayed plots was compared with that from corresponding diseased plots.
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